Font size
Worksheets9.2 Ls1 An Invader in Yellowstone National Park
Total questions: 40
Worksheet time: 54mins
When a ________________ enters an area where it does not usually live, and it competes with the native species in their habitat, that species is called an invasive species
space creature
sea animal
fly
species
If there are no invaders, then an _____________ works one way.
oven
always
ecosystem
billfish
But an invader can change many aspects of an ecosystem. It changes what happens as it enters the food web.
true
false
no
Fish populations are important to the Yellowstone food web. One fish, a type of _____________, is called the cutthroat trout.
helicopters
group
trout
human
In Yellowstone, an invader began to compete with the ________________ trout. The invader is a species you know—the lake trout.
swordfish
cutthroat
shark
lemon
Cutthroat trout sometimes eat young, other fish, but mostly they eat _________________.
insects
eels
eggs
bacon
Some insects, like mayflies, hatch on the surface of the water. Some insects live in the water and some, like grasshoppers, fall into the water.
true
false
no
Of course, cutthroat trout need other things to eat, but they are known more as prey than as ________________.
human
predators
shark
prey
Humans eat cutthroat trout, and many park animals, such as ___________, eagles, and otters eat them, too.
mayflies
bears
pigs
snails
Scientists say that the cutthroat trout is NOT very important to Yellowstone’s ecosystem.
true
false
yep yep
That is why scientists are concerned that fewer cutthroat trout are now found in the waters of _______________ Park.
Yellowstone
Smokey Mountain
Yosemite
Bulldog
In one creek, people who measure wildlife populations counted 2,300 fish one year, and five years later, they counted only one fish. In another creek, the number of cutthroat trout decreased _________ from one year to the next year.
58%
5.8%
5%
8%
Which geyser is this?
Old Faithful
Castle Geyser
Great Fountain Geyser
None of these
What happened to the Hare population after the decrease in Lynx population in 1860?
The decrease of lynx led to an increase in the amount of hares.
The decrease of lynx led to a decrease in the hare population.
The hare population stayed the same.
How did the increased population of wolves in year 5 affect the deer population in year 6?
The increase in wolves led to a decrease in deer.
There was no effect because the data showed that the population stayed the same.
The increase in wolves led to an increase in deer.
When Yellowstone National Park was created in the late 1800s, wolves were on the decline. The last wolves in Yellowstone were killed in 1926, but in the 1800s, there were between 100- 160 wolves in the park. In 1995, gray wolves were reintroduced to the park. Using what you know about populations, predict the growth of the wolves on the graph below.
True or False. You should NEVER swim in Yellowstone's thermal (hot) pools, like the one in the picture.
TRUE
FALSE
Which animal would you find in Yellowstone National Park?
Who manages Yellowstone?
National Park Services
Donald Trump
People Outdoors
Indiana Park Rangers
A group of the same kind of organism living together in the same area.
Organism
Herd
Population
Biology
Biology is the study of
animals only
plants only
living things
nonliving and living things
Biologists call living things
organisms
interactions
biology
animals
Which statement best describes the trend on the graph?
The population did not change over the years
The population increased over the years
The population decreased over the years
Sandra left her apple on the table and returned 5 minutes later to finish it. The picture shows what the apple looked like when she got back. Which of the following are OBSERVATIONS about the apple?
The apple changed shape from when she left it.
An organism ate her apple
There are bite marks in her apple.
What is a fitting description for this diagram?
The Mayfly is a food source for which 3 organisms?
The trout is a source of food for the human and the eagle. When there are more than one organism vying for the same source we call this____?
Which of the following would be the most likely effect, if there were a sudden increase in the cricket population?
There would be a decrease in the small bird population.
There would be a decrease in the grass/flowers population.
There would be a decrease in the mice population.
There would be an increase in the grass/flowers population.
